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DNSTOP(8)		  BSD System Manager's Manual		     DNSTOP(8)

NAME
     dnstop — displays various tables of DNS traffic on your network

SYNOPSIS
     dnstop [-46apsQR] [-b expression] [-i address] [-f filter] [-r interval]
	    [device] [savefile]

DESCRIPTION
     dnstop is a small tool to listen on device or to parse the file savefile
     and collect and print statistics on the local network's DNS traffic. You
     must have read access to /dev/bpf*.

COMMAND LINE OPTIONS
     The options are as follows:

     -4	     count only messages with IPv4 addresses

     -6	     count only messages with IPv6 addresses

     -Q	     count only DNS query messages

     -R	     count only DNS reply messages

     -a	     anonymize addresses

     -b expression
	     BPF filter expression
	     (default: udp port 53)

     -i address
	     ignore select addresses

     -p	     Do not put the interface into promiscuous mode.

     -r	     Redraw interval (seconds).

     -l level
	     keep counts on names up to level domain name levels.

	     For example, with -l 2 (the default), dnstop will keep two
	     tables: one with top-level domain names, and another with second-
	     level domain names.  Increasing the level provides more details,
	     but also requires more memory and CPU.

     -f	     input filter name

	     The "unknown-tlds" filter includes only queries for TLDs that are
	     bogus.  Useful for identifying hosts/servers that leak queries
	     for things like "localhost" or "workgroup."

	     The "new-gtlds" filter includes only queries for the new gTLD
	     program of 2013/2014.  Useful for identifying hosts/servers that
	     use names which may result in future collisions and problems when
	     new gTLDs become active.

	     The "A-for-A" filter includes only A queries for names that are
	     already IP addresses.  Certain Microsoft Windows DNS servers have
	     a known bug that forward these queries.

	     The "rfc1918-ptr" filter includes only PTR queries for addresses
	     in RFC1918 space.	These should never leak from inside an organi‐
	     zation.

	     The "refused" filter, when used with the -R option, tells dnstop
	     to count only replies with rcode REFUSED.

	     The "qtype-any" filter tells dnstop to count only message of type
	     ANY.

     -n name
	     Only count messages within the domain name

     -P	     Print "progress" messages on stderr when in non-interactive mode.

     -B buckets
	     Use buckets hash table buckets.

     -X	     Do not tabulate the sources + query name counters.	 This can sig‐
	     nificantly reduce memory usage on busy servers and large save‐
	     files.

     savefile
	     a captured network trace in pcap format

     device  ethernet device (ie fxp0)

RUN TIME OPTIONS
     While running, the following options are available to alter the display:

     s	     display the source address table

     d	     display the destination address table

     t	     display the breakdown of query types seen

     r	     display the breakdown of response codes seen

     o	     display the breakdown of opcodes seen

     1	     show 1st level query names

     2	     show 2nd level query names

     3	     show 3rd level query names

     4	     show 4th level query names

     5	     show 5th level query names

     6	     show 6th level query names

     7	     show 7th level query names

     8	     show 8th level query names

     9	     show 9th level query names

     !	     show sources + 1st level query names

     @	     show sources + 2nd level query names

     #	     show sources + 3rd level query names

     $	     show sources + 4th level query names

     %	     show sources + 5th level query names

     ^	     show sources + 6th level query names

     &	     show sources + 7th level query names

     *	     show sources + 8th level query names

     (	     show sources + 9th level query names

     ^R	     reset the counters

     ^X	     exit the program

     space   redraw

     ?	     help

NON-INTERACTIVE MODE
     If stdout is not a tty, dnstop runs in non-interactive mode.  In this
     case, you must supply a savefile for reading, instead of capturing live
     packets.  After reading the entire savefile, dnstop prints the top 50
     entries for each table.

HOW MESSAGES ARE COUNTED
     By default dnstop examines only query messages and ignores replies.  In
     this case the response code table is meaningless and will likely show
     100% "Noerror."

     If you supply (only) the -R command line option, dnstop examines replies
     and ignores queries.  This allows you to see meaningful response code
     values, as well as all the other tables.  In this case all the query
     attributes (such as type and name) are taken from the Question section of
     the reply.

     Note, however, that it is common for a stream of DNS messages to contain
     more queries than replies.	 This could happen, for example, if the server
     is too busy to respond to every single query, or if the server is
     designed to ignore malformed query messages.  Therefore, you might want
     to examine both queries and replies by giving both -R and -Q command line
     options.  In this case, only the response code counts are taken from the
     replies and all other attributes are taken from the queries.

AUTHORS
     Duane Wessels (wessels@measurement-factory.com)
     Mark Foster (mark@foster.cc)
     Jose Nazario (jose@monkey.org)
     Sam Norris <@ChangeIP.com>
     Max Horn <@quendi.de>
     John Morrissey <jwm@horde.net>
     Florian Forster <octo@verplant.org>
     Dave Plonka <plonka@cs.wisc.edu>
     http://dnstop.measurement-factory.com/

BUGS
     Does not support TCP at this time.

BSD				21 March, 2008				   BSD
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